Reaction of zinc enolates prepared from 2,2-dibromoindan-1-one or 2,2-dibromo-1-tetralone and zinc with 2-oxochromen-3-carboxylic acid derivatives
摘要:
Zinc enolates obtained from 2,2-dibromoindan-1-one or 2,2-dibromo-1-tetralone and zinc reacted with alkyl esters and amides of 2-oxochromen-3-carboxylic acid giving the corresponding derivatives of 2,1'-dioxospiro(1a, 7b-dihydrocyclopropa[c]chromen-1,2'-indan)- or 1',2',3',4'-tetrahydro-2,1'-dioxospiro(1a,7b-dihydrocyclopropa[c] chromen-1,2'-naphthalene)-1a-carboxylic acids prevailingly in the form of a single geometric isomer.
Reaction of some coumarin and 4,6-diaryl-2<i>H</i>-pyran derivatives with secondary amines
作者:Ibrahim El-Sayed El-Kholy、Morcos Michael Mishrikey、Hassan Mostafa Feid-Allah
DOI:10.1002/jhet.5570180122
日期:1981.1
The reaction of piperidine, morpholine, piperazine or dimethylamine with several coumarins, 3-bromocoumarin, 4,6-diaryl-2H-pyran-2-ones and 3-bromo-4,6-diaryl-2H-thiopyran-2-ones gave o-hydroxycinnamic acid amides, benzofurans, open-chain δ-oxoamides and thiophene derivatives, respectively.
KPF<sub>6</sub>-Mediated Esterification and Amidation of Carboxylic Acids
作者:Sonam、Vikki N. Shinde、Anil Kumar
DOI:10.1021/acs.joc.1c02611
日期:2022.3.4
been developed for the synthesis of esters and amides. A wide range of carboxylicacids and alcohols or amines worked well under the developed reaction conditions, thus providing good to excellent (61–98%) yields of the corresponding esters and amides. The method worked well with bioactive substrates such as cholesterol, levulinic acid, and linoleic acid. Wide substrate scope, operational simplicity
An efficient three-component synthesis of coumarin-3-carbamides by use of Ni–NiO nanoparticles as magnetically separable catalyst
作者:Nayim Sepay、Chayan Guha、Arpan Kool、Asok K. Mallik
DOI:10.1039/c5ra13932e
日期:——
An efficient and ecofriendly synthesis of coumarin-3-carbamides has been developed by a three-component reaction of 2-hydroxybenzaldehydes, aliphatic amines (p-/s-) and diethyl malonate using Ni–NiO nanoparticles as catalyst.
Potassium Fluoride Promoted Reaction of 3-Acylsubsti-Tuted 2H-1-Benzopyran-2-Ones with Acid Anhydrides. An Improved Method for the Synthesis of 4-(2-Oxoalkyl)-2H-Chroman-2-Ones. Part III<sup>1</sup>
作者:Anka Bojilova、Nestor A. Rodics、Rozitsa Nikolova、Christo Ivanov
DOI:10.1080/00397919208019275
日期:1992.3
Abstract The reaction of 3-acylsubstituted 2H-1-benzo-pyran-2-ones 1, 5 and 11a-c with acid anhydrides in the presence of potassiumfluoride (KF)/molecular sieves 4A gives the 4-(2-oxoalkyl)-2-oxochromans 2, 6 and 12a-c as the main products. Also the 3-carboxylic acid derivatives, such as esters and N,N-dialkylamides, of 2H-1-benzopyran-2-one (11d-g) react with isobutyric acid anhydride in the presence
Design, synthesis, and acetylcholinesterase inhibitory activity of novel coumarin analogues
作者:Xiang Zhou、Xiao-Bing Wang、Tao Wang、Ling-Yi Kong
DOI:10.1016/j.bmc.2008.07.068
日期:2008.9
Three series (series A-C) of coumarin analogues with phenylpiperazine functions as substitution were designed and synthesized for studying their potential for treating Alzheimer's (AD) disease. Their anticholinesterase activities were assayed according to Ellmann's method against freshly prepared acetylcholinesterase (AChE) from Electrophorus electricus using donepezil as the reference compound. Pharmacological study and preliminary structure-activity relationships showed that coumarins with substitution on positions 3 and/or 4 have parallel anti-AchE activities compared with the reference compound. (C) 2008 Elsevier Ltd. All rights reserved.